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The United Kingdom is one of the most important markets in Europe for patents, and after Brexit it is also one of the most misunderstood. If you are working out how to file a patent in United Kingdom territory, the first thing to know is that leaving the EU did not change your filing options at all: the UK is still a full member of the European Patent Convention, so a European patent can still take effect here. What did change is enforcement — the UK is not part of the Unified Patent Court. This guide walks through the three routes into UK protection, the search and examination deadlines that quietly end applications, the real costs, and the courts that decide disputes.
How to File a Patent in United Kingdom: Three Routes That Differ
There are three genuinely different ways into UK patent protection, and the choice is strategic rather than administrative. Deciding how to file a patent in United Kingdom jurisdictions means picking between a national right, a European right that takes effect here, or the international system:
- National filing at the UKIPO — a UK patent, searched, examined and granted by the UK Intellectual Property Office, covering the United Kingdom only.
- European patent via the EPO — granted centrally by the European Patent Office and then taking effect in the UK. Because the UK left the Unitary Patent, this is always a classical European patent (UK), never a Unitary Patent.
- PCT route — an international application that later enters either the UK national phase directly at the UKIPO or the European regional phase at the EPO before taking effect here.
For UK-only protection, a direct UKIPO filing is by far the cheapest. If you want several European countries, the European patent route is usually more efficient than filing nationally in each. The PCT route sits on top of both, buying time before you commit.
Route 1: A National Filing at the UKIPO
You file the application with the UKIPO in English. Filing alone, though, does not move the application forward: the UK system runs on two separate requests you must remember to make. First you request a search (Form 9A), normally within 12 months of your filing or priority date. The application is then published at around 18 months, and you must request substantive examination (Form 10) within six months of that publication. Miss either request and the application is treated as withdrawn.
Everything then has to be in order within the compliance period — four years and six months from your filing or earliest priority date (or one year from the first examination report, whichever is later). A UK patent lasts up to 20 years from filing, with renewal fees due annually from the fifth year onward. Confirm the current figures on the UKIPO’s own forms and fees page before you budget.
One practical tip for foreign applicants: the UKIPO offers a combined search-and-examination option and, separately, an accelerated process (including the Green Channel for environmentally beneficial inventions) that can bring grant forward significantly when speed matters.
Route 2: A European Patent That Takes Effect in the UK
Brexit is where most applicants go wrong. The European Patent Convention is not an EU instrument, and the UK remains a full member. So a European patent granted by the EPO can still designate and take effect in the UK exactly as before. Better still, because English is an official EPO language and the UK is a London Agreement country, a European patent granted in English needs no translation and no formal validation filing to take effect here — you simply keep it in force by paying UK renewal fees to the UKIPO.
The one thing Brexit did remove is the Unitary Patent: it does not cover the UK, and the Unified Patent Court has no jurisdiction here. A European patent that reaches the UK is therefore always a national UK right enforced in the UK courts. Our European patent validation guide and our note on European patent drafting cover the wider EPC mechanics.
Route 3: The PCT Route Into the UK
If the UK is one of several target markets, a PCT application preserves your options across more than 150 countries from a single filing. To reach the UK you later enter either the UK national phase directly at the UKIPO or the European regional phase at the EPO — both with a deadline of 31 months from your priority date. Applicants who want broad European coverage usually enter the EPO regional phase and then take effect in the UK from the granted European patent.
Whichever door you use, the priority chain is the same: file, claim priority within 12 months under the Paris Convention if you filed abroad first, then hit the 31-month PCT deadline. See our Paris Convention priority claim guide and our Euro-PCT regional phase entry guide for the mechanics that trip applicants up.
National, European, or PCT: Which Route Fits?
The route is not just a filing decision — it sets your cost base, your geographic reach, and how a future dispute unfolds. A national UKIPO patent makes sense when the UK is your only real market, when budget is tight, or when you want the fastest, leanest path to a granted right. It protects nothing outside the United Kingdom, but for many British businesses that is exactly the point.
A European patent that takes effect in the UK suits an applicant who wants the UK plus a handful of other EPC states from one prosecution before the EPO. You gain efficiency across borders, but remember the post-Brexit reality: the UK slice is a stand-alone national right that lives or dies in the UK courts, separately from the Unitary Patent covering the participating EU states.
In practice, many foreign applicants file a PCT application first, enter the European phase at the EPO, and decide how far to push into the UK and elsewhere only later, when they know which markets have proven worth the money. Keeping that decision open is often the smartest part of the plan.
Costs and the Deadlines You Can’t Miss
A direct UKIPO filing is inexpensive to start, which is one reason the UK is a popular first-filing country: the application, search and examination fees are modest, and you can even file to secure a date before paying the search fee. The European route costs more up front (EPO filing, search, examination and grant fees) but can be cheaper than filing nationally across many countries. Budget realistically and take current figures from the office before filing.
- Request a UKIPO search: normally within 12 months of filing (Form 9A).
- Request substantive examination: within 6 months of publication (Form 10).
- Compliance period: 4 years 6 months from filing or earliest priority.
- PCT national/regional phase entry: 31 months from the priority date.
- Paris Convention priority: 12 months from your first filing.
Where UK Patent Disputes Are Heard
The UK’s enforcement system is one of its strengths, and it is entirely national. Higher-value or technically complex disputes go to the Patents Court, part of the High Court in London, known for detailed technical judgments. The UKIPO tribunal also hears certain validity and entitlement matters.
Smaller businesses and lower-value claims can use the Intellectual Property Enterprise Court (IPEC), where costs and damages are capped — broadly £50,000 in recoverable costs and £500,000 in damages on the multi-track — making enforcement realistic for SMEs that could never fund a full High Court action.
The point Brexit made permanent: none of this runs through the Unified Patent Court. A UK patent — national or a European patent taking effect here — is enforced and revoked only in the UK courts. If you expect to enforce, an early patent invalidation search in London or a focused prior-art litigation search in Birmingham can sharpen your position long before a claim is issued. Our United Kingdom IP services hub sets out the full local footprint.
How PerspireIP Can Help You File in the UK
The UK system rewards applicants who plan the route, the search-and-examination timing, and the enforcement forum together. PerspireIP helps inventors and foreign applicants choose between the UKIPO, EPO and PCT paths, meet every deadline, and prepare for the UK courts. Talk to our team about your UK filing. This article is general information, not legal advice; consult a qualified attorney for your situation.
Frequently Asked Questions
Did Brexit change how to file a patent in the United Kingdom?
No. The European Patent Convention is not an EU treaty, so the UK is still a full member and a European patent can still take effect here. Brexit only removed the UK from the Unitary Patent and the Unified Patent Court, so enforcement is now purely national.
Do I have to request search and examination separately at the UKIPO?
Yes. Filing does not start the process. You request a search (normally within 12 months) and substantive examination (within six months of publication) as separate steps, and everything must be in order within the compliance period of four years and six months.
Can a European patent cover the UK after Brexit?
Yes. A European patent granted by the EPO takes effect in the UK, and because English is an EPO language and the UK is a London Agreement country, no translation or formal validation filing is needed — you just pay UK renewal fees.
How long does a UK patent last?
Up to 20 years from the filing date, provided renewal fees are paid to the UKIPO annually from the fifth year onward.
Where are UK patent infringement cases heard?
In the Patents Court (part of the High Court) for higher-value disputes, or the Intellectual Property Enterprise Court (IPEC) for smaller claims with capped costs and damages. The Unified Patent Court has no jurisdiction in the UK.